Boron trifluoride etherate → (3AS,6aR)-1,3-dibenzyltetrahydro-1H-furo(3,4-d)imidazole-2,4-dione

HRID 463741노트

반응식

HRID 463741 반응식
[CH2:1]([N:8]1[C@H:12]([C:13](OC)=[O:14])[C@H:11]([C:17](O)=[O:18])[N:10]([CH2:20][C:21]2[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=2)[C:9]1=[O:27])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[BH4-].[Na+].B(F)(F)F.CCOCC.C(=O)([O-])[O-].[K+].[K+]>O1CCCC1>[CH2:20]([N:10]1[C@H:11]2[CH2:17][O:18][C:13](=[O:14])[C@H:12]2[N:8]([CH2:1][C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=2)[C:9]1=[O:27])[C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1

참가 물질

6

반응물 4

HCID 8000Boron trifluoride etherateHCID 11430Potassium CarbonateHCID 4311764Sodium borohydrideHCID 11428617(4R,5S)-1,3-dibenzyl-5-methoxycarbonyl-2-oxoimidazolidine-4-carboxylic acid

생성물 1

HCID 119819(3AS,6aR)-1,3-dibenzyltetrahydro-1H-furo(3,4-d)imidazole-2,4-dione수율 49.7%

시약·촉매·용매 1

HCID 8028Tetrahydrofuran용매

실험 절차

To a solution of (4R,5S)-1,3-dibenzyl-5-methoxycarbonyl-2-oxoimidazolidine-4-carboxylic acid (mp., 149°-150° C., [α]36525 =+27.4° at c=1 in DMF, 1.84 g) in tetrahydrofuran (15 ml) were added sodium borohydride (226 mg) in small portions at -20° C., and boron trifluoride etherate (1.06 g). The obtained mixture was stirred at the same temperature for 1 hour and at room temperature for 3 hours, poured into ice-water (50 ml), stirred further at room temperature, adjusted to pH 9 with aqueous potassium carbonate and extracted twice with ethyl acetate (50 ml). Organic layer was washed with saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by chromatography on silica gel column to give (3aS,6aR)-1,3-dibenzylhexahydro-1H-furo[3,4-d]imidazole-2,4-dione (0.80 g). M.P., 114°-118° C. [α]D 20 =+59.8° (c=1, CHCl3).

후처리

  1. stirringstirred further at room temperature
  2. extractionextracted twice with ethyl acetate (50 ml)
  3. washOrganic layer was washed with saturated aqueous sodium chloride solution
  4. dry with materialdried over anhydrous magnesium sulfate
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was purified by chromatography on silica gel column

출처 및 근거

ORD 기록
ord-4574fc0046634e2196eab93a4b8511d6
출처 데이터셋
uspto-grants-1985_10
특허 번호
US04544635

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